Fault Finding; Fault Finding Chart Main Menu - Ideal Boilers LOGIC MAX HEAT H 18 Installation & Servicing

4.1 FAULT FINDING CHART MAIN MENU

In order to assist fault finding the boiler has a 7 segment display. The key to the display codes is as follows:
'F2' or 'Fn' or 'Ln'
'F9' or 'L9' or 'F8' or 'L8'
NO DISPLAY
RESTART PROCEDURE - To restart boiler, press the "RESTART" button.
Installation and Servicing
SECTION 4 - FAULT FINDING
'L1'
'L2'
'LC'
'L6'
'L7'
'FA'
'Fd'
'F3'
'L4' or 'F4'
'L5' or 'F5'
'F6'
'F7'
'FU'
NO CH
NO HW
GO TO SECTION 4.2 -
FLOW TEMPERATURE OVERHEAT LOCKOUT
or NO WATER FLOW LOCKOUT
GO TO SECTION 4.3 -
IGNITION LOCKOUT
5 RESTARTS WITHIN 15 MINS -
TURN POWER OFF AND ON
GO TO SECTION 4.4 -
FALSE FLAME LOCKOUT
<5ºC RISE ON 3 SUCCESSIVE OCCASIONS.
CHECK THERMISTORS ARE CLIPPED ONTO PIPES
Note: burner will be switched off for 2 mins between
attempts. Function inactive if temperature is >40ºC.
GO TO SECTION 4.5 -
FLOW / RETURN REVERSED
GO TO SECTION 4.6 -
NO WATER FLOW
GO TO SECTION 4.7 -
FLAME LOSS
GO TO SECTION 4.8 -
FAN FAULT
GO TO SECTION 4.9 -
CONTROL/NO FLOW THERMISTOR FAULT
GO TO SECTION 4.10 -
RETURN THERMISTOR FAULT
GO TO SECTION 4.11 -
OUTSIDE SENSOR FAULT
LOW MAINS VOLTAGE -
CONTACT ELECTRICITY PROVIDER
PCB UNCONFIGURED/FAULTY OR GAS VALVE
SHORT CIRCUIT. SEE SECTION 3.18. IF
FAULT PERSISTS REPLACE PCB
DIFF GREATER THAN 50ºC. CHECK ISOLATION
VALVES ARE OPEN, CHECK PUMP, CHECK RAD
VALVES OPEN, CHECK SYSTEM BLOCKAGES.
GO TO SECTION 4.12
GO TO SECTION 4.14
GO TO SECTION 4.13
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